Administration
The product is using wireless M-Bus mode C1-b, which means that it sends spontaneous data in one direction, from sensor to collector device.
The product supports two different encryption modes, unencrypted and encrypted mode. In encrypted mode, an AES 128-bit algorithm is used to encrypt all data transmitted from the sensor. In unencrypted mode, no data will be encrypted.
The product will automatically begin to transmit data after the activation has been completed. By default, a SND_NR telegram will be transmitted every third minute. The following table lists all the data included in the telegram (SND_NR).
Table 117. Slave to master
|
Byte index |
Data |
Description |
|---|---|---|
|
0x55 |
Preamble |
|
|
0x55 |
Preamble |
|
|
0x55 |
Preamble |
|
|
0x55 |
Preamble |
|
|
0x54 |
Sync word byte 0 |
|
|
0x3D |
Sync word byte 1 |
|
|
0x54 |
Sync word byte 2 |
|
|
0x3D |
Sync word byte 3 |
|
|
0 |
0xnn |
L Field |
|
1 |
0x44 |
C Field: SND_NR |
|
2..3 |
0x9615 |
Manufacturer “ELV” |
|
4..7 |
0xnnnnnnnn |
Identification number |
|
8 |
0x1E |
Version field |
|
9 |
0x1B |
Device type (Medium) = Room sensor |
|
10 |
0x7A |
0x7A = short application header |
|
11 |
0xnn |
Access number, increases after each transmission (0…255) |
|
12 |
0xnn |
Status. Bit 2 (0x04) represents “low battery flag”, bit 3 (0x08) represents “sensor fault flag”. Default is STATUS = 0x00 |
|
13..14 |
0xnnnn |
CONFIG: Bit 7..4 = 0 or 2, number of encrypted 16 byte block, 0 if encryption = OFF Bit 11..8 = encryption mode, 5 with encryption, 0 without encryption |
|
15 |
0x2F |
Decryption verification byte 1 |
|
16 |
0x2F |
Decryption verification byte 2 |
|
17 |
DIF |
16-bit integer = 0x02 or 0x32 at sensor error |
|
18 |
VIF |
0x65 = external temperature in “centi Celsius” |
|
19..20 |
0xnnnn |
Instantaneous temperature x 100 At sensor error, temperature will be set to 0x0000 |
|
21 |
DIF |
16-bit integer =0x42 or 0x72 at sensor error |
|
22 |
VIF |
0x65 = external temperature in “centi Celsius” |
|
23..24 |
0xnnnn |
1h average temperature x 100 At sensor error, temperature will be set to 0x0000 |
|
25 |
DIF |
0x02 (16-bit integer) |
|
26 |
VIF |
0xFD |
|
27 |
VIFE |
0x1B |
|
28..29 |
0xnnnn |
Battery status |
|
30 |
0x0D |
Firmware version DIF |
|
31 |
0xFD |
Firmware version VIF |
|
32 |
0xFD |
Firmware version VIFE = “Other software version” |
|
33 |
0x05 |
Length of firmware string (varying) |
|
34..38 |
0xnnnnnnnnnn |
Firmware version in format: Major.Minor.PatchLevel |
|
39 |
0x0F |
End of telegram, no more data |
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